Wrench



Patented Sept. 27,1921.-

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WRENCH.

APPLICATION FILED MAY 5,1920.

UNITED STATES CHARLES C. STEWART, OF STODIDARD, ARIZONA.

WRENCH.

Specification. of Letters Patent.

Patented Sept. 27,1921.

Application filed May 5, 1920. Serial No. 379,115.

T 0 all whom it may concern Be it known that I, CHARLES C. STEWART, a citizen of the United States, residing at Stoddard, in the county of Yavapai and State of Arizona, have invented certain new and useful Improvements in renches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a wrench, and more particularly to an implement of the type indicated designed for use either as a pipe wrench or a monkey wrench.

Qne object of the invention is to provide in connection with a stationary jaw and a relatively movable jaw, a block, slidable with reference to one of said jaws, and movable toward the other jaw when pressure is applied to the handle, the block being retained in a stationary position and with its working face substantially parallel with the face of the other jaw, when the tool is used as a monkey wrench.

A further object is to provide in connection with a stationary jaw and a relatively movable jaw, a block having a beveled surface cooperating with an inclined surface formed on one of the jaws, and to provide in connection with such structure suitable guiding and retaining elements.

A still further object is to provide in connection with a stationary jaw and a relatively movable jaw, a block one surface of which is substantially parallel with the opposing surface or working face of the movable jaw, the block, converging slightly with reference to the opposing face of the other jaw, and means for guiding the block and permitting it to move longitudinally and toward and away from the movable jaw.

A still further object is to provide, in a device of the class indicated, particular means for retaining the movable block, and permitting the limited movement thereof, and resilient means mounted in a particular manner for restoring the block to its outer or normal position when the handle is relieved of the pressure applied during the operative movement ,of the device used as a pipe wrench.

With the foregoing and other objects in view, the invention consists in the novel construction, combination, and arrangement of elements hereinafter described and claimed.

In the accompanying drawings Figure 1 is a plan view of the wrench, with elements in dotted lines.

Fig. 2 is a transverse section through the movable block and portion of the stationary jaw on which it is mounted.

Fig. 3 is a bottom plan view of the movable block.

Figs. 4: and 5 are details of construction described below.

In carrying out my invention I employ a stationary jaw 10 and a relatively movable jaw 12, the shank portion 13 of the latter being threaded in the usual manner, as shown at 1d, and being engaged by threading sleeve 15.

The stationary jaw 10 is inclined in the direction shown and is provided with a dovetailed groove 17 with which the tongue 18 of the movable block 20, cooperates.

The surface 21 of the block 20 is substantially parallel with the surface 22 of the movable jaw. The toothed portions 22 and 21 tend to converge slightly, so that a pipe or rod engaged by the jaws will be clamped thereby.

The block 20 is provided with an aperture 25 in the lower side thereof, the aperture communicating with the slot 26 and a stop pin 27 passes through a bore 28 in the sta tionaryjaw, and the end of the pin or stop enters the aperture 25, for retaining the jaw in proper position, and preventing the outward movement thereof. The head 29 of the stop pin is provided with notches 30 and 31 on opposite sides thereof,and either of the notches may be engaged by a key 32, normally forced outwardly by a spring 33. This key is cut away at its outer end, and the projecting portion 34 extends slightly over from the outer surface when the elements are in operative position. The upper end, or inner end, of the pin 27 is cut away as shown, to form a projecting element 86, and when the pin is turned in a given position this projecting element will engage the walls of the aperture 25 positively and prevent the outward movement of the slidable block. One of the notches in the head of the stop pin 27 is then engaged by the key 32. This key is released and the pin rotated through a half revolution, the other of said notches in the head being engaged by the key, and the element or bit 36 on receives a flat spring 39 having an element 40 for one end thereof, the latter being approximately of the same cross section as the cross section of the bore. The free end of the spring cooperates with the notch 12 in the block, for the purpose of restoring the latter to normal position. The movement of the block is limited to the extent determined by the space between the inner end of the block and the shank portion of the jaw 12, and the pipe is not damaged by undue movement of the block andunneces sary gripping action resulting therefrom.

In the use of the device it is not necessary at all times to set the block 20 rigidly with reference to the stationary jaw when turning up for using the device on pipes or as a monkey wrench, since the block will remain sufficiently stationary for the purpose indicated, but the stop pin 27 is desirable when making use of the tool as a monkey wrench. The faces 21 and 22 of the jaws being substantially parallel, the corners of a nut are not cut nor damaged and the same remark holds true though the toothed portions of the jaws also engage the nut to a slight extent, since the toothed portions converge gradually.

It will be observed that no screws or rivets are required in assembling the elements and in removing the slidableblock, it is only necessary to depress the spring key 82 and then withdraw the stop pin 27. While I have shown the improvements as applied to a well known type of wrench, it is obvious that the particular arrangement of the main jaws, such as 10 and 12, is immaterial, and it is further clear that details of construction may be varied within the scope of the appended claims.

What is claimed is 1. In a device of the class described, a stationary jaw, a movable jaw, a working block slidable along the face of the stationary jaw, and having tongue and groove connection therewith, said block having an opening therein and a slot communicating with the opening, a stop pin passing through the stationary j aw and entering said opening, said pin having a reduced end portion, the reduced portion cooperating with the opening and slot and being adapted to retain the block against slidable movement and at times to permit of limited slidable movement, and a key for retaining said pin in position to perform either of said functions.

2. Ina device-of the class described, a stationary jaw, a movable jaw, the stationary jaw having an inclined face, a block wedge shaped in cross section, having tongue and groove connection with the jaw first named and slidable with reference thereto, the working face of the block and the working face of the movable aw converging at their inner portions, resilient means for normally forcing the block outwardly to inoperative position, the block having an opening therein and a slot communicating with the opening, a stop pin having a reduced end portion cooperating with said opening and the slot and adapted to retain the block in 'a given position and to retain it at times in a position permitting limited slidable movement, said pin including ahead having notches in opposite sides thereof, and a spring held locking key adapted to engage either of said notches.

3. In a device of the class described, a stationary jaw, a movable jaw, a working block slidable along the face of the stationary aw and having a tongue and groove connection therewith, said block having a slot extended therein from one edge and terminating in an enlarged openingor head at its inner end, a stop pin passing through the stationary jaw and entering said slot, said pin being formed so as to be turned to serve as a guide for the working block and permit movement thereof on th stationary jaw, said pin being also adapted to be turned in the head of the slot to lock the working block against sliding movement on'said stationary jaw, means to retain said stop'pin in adjusted position and prevent'displacement or loss of said stop pin, and means carried by said stationary jaw to resiliently retain said working block in one position on said stationary jaw.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES C. STEWART.

Witnesses G. H. SoHorIELn, F. C. PAYTON. 

